OBD1 ls/vtec

just got another car (1995 integra RS), and im gonna slap on a B16/18 head on it sometime down the line. i was just wondering, since the 95 is a obd1, when i add the vtec head, do i gotta swap to a obd2 and go through the trouble? or just get a different ecu like a p72 or p28?

also, the rs didn't come with a/c, so is it possible to drop in a compressor, do some wiring and have a working a/c? if so, how much?

Power wise I have not heard of a difference. An OBD2 head will work if you swap distributors with an OBD1 VTEC head. I don't think (but am not positive, confirmation would be nice) that there are any differences in the other sensors on the head/IM. The TB sensors might be different.